Figure 11 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology - Question 6 - 2020 - Paper 1
Question 6
Figure 11 shows the time taken for blood to clot at different temperatures.
| temperature in °C | time taken for blood to clot in seconds |
|-------------------|---... show full transcript
Worked Solution & Example Answer:Figure 11 shows the time taken for blood to clot at different temperatures - Edexcel - GCSE Biology - Question 6 - 2020 - Paper 1
Step 1
Draw a graph to show the data in Figure 11.
96%
114 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
To draw the graph, do the following:
Set up axes: Label the x-axis as 'Temperature (°C)' and the y-axis as 'Time taken for blood to clot (seconds)'.
Determine scale: Use a linear scale for both axes, ensuring even spacing.
Plot points: Mark each temperature against the corresponding time taken to clot based on Figure 11:
(5, 90)
(15, 70)
(25, 55)
(35, 40)
(45, 110)
Connect points: Draw a smooth line or use dots to represent the points, illustrating the trend of the data.
Step 2
Give two safety precautions that should be used when handling blood samples.
99%
104 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Wear gloves to prevent direct contact with blood and reduce the risk of contamination.
Wash hands thoroughly after handling blood samples to eliminate any potential pathogens.
Step 3
Which part of the blood causes blood to start clotting?
96%
101 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
C platelets
Step 4
Give one advantage of a blood clot forming.
98%
120 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
One advantage of a blood clot forming is that it prevents excessive bleeding by sealing a wound.
Step 5
Explain how one structure of a vein helps the blood return to the heart.
97%
117 rated
Only available for registered users.
Sign up now to view full answer, or log in if you already have an account!
Answer
Veins have valves that prevent the backflow of blood, ensuring that it moves in one direction towards the heart. This is particularly important in the extremities where blood has to travel against gravity.
